Hello Blueize,
I like your username,

interesting dream, the skin layer on our body acts as a shield to protect us from the outside world, it is our first line of defence. its the same as the face, the first thing people notice about us.
perhaps the dream is telling you that you are letting down your defences, trying to find (or prove to others and yourself) your strength, who you really are under the mask. however you stop, you are unsure of what you are doing and think it has gone too far.
a scar may represent deep-seeded insecurities which may be holding you back from accomplishing your goals. this dream could be telling you that you are too concerned with what others think and continuously try to prove yourself to others "exposing your strength" however you tend to be haunted by memories of the past frequently.
best
Kid